Here are some chess puzzles from the games of Alexander Koblencs.
The color disk on the diagram indicates who moves first.

Solutions are between the brackets under each puzzle.
Drag your cursor from one bracket to the other.

a)
Koblenc vs Viacheslav Ragozin, Moscow, 1945
2B2R2/1pp5/k2p4/q7/3B3p/8/5N1K/8 w - - 1 0
[ Bd7 ]

b)
Koblenc vs T Zeids, Riga, 1955
rn6/p3kpQ1/qpp2n2/3p4/3P1P2/P1N5/1P3P2/R1B3K1 w - - 1 0
[ f5 if Qd3 Bg5 Qxf5 Re1+ or if Nfd7 Bg5+ mates ]

c)
White mates in 2.
Koblenc vs Janis Klovans, Riga, 1964
6k1/ppp3r1/4P2p/b5pP/2P5/1K1QP1q1/P5P1/1R3R2 w - - 1 0
[ Rf8+ ]

d)
P Herman vs Koblenc, Brno, 1937
4b3/q5pk/r2p1p1p/2pPpP2/p1P1P1P1/1P4R1/Q1N1K2P/8 b - - 0 1
[ ...axb3 Qxb3 Ba4 Qc3 Bxc2 if Qxc2 Ra2 ]

e)
Black mates in 2.
Vladimir Alatortsev vs Koblenc, Moscow, 1945
2k4r/pp1bn3/2pb4/3p1p2/1P1P1Ppq/1RQ5/P2BP1Br/4NRK1 b - - 0 1
[ ...Rh1+ ]

Koblenc Puzzles, Part II. The color disk on the diagram indicates who moves first.
a)
Nikolay Kopylov vs Koblenc, Leningrad, 1950
5R2/6pk/p4p1p/rPp2P2/4qN2/1QP2bPP/P6K/8 b - - 0 1
[ ...c4 if Qb2 Rxb5 Qd2 Qb1 ]

b)
Black mates in 3.
Mikhail Tal vs Koblenc, Latvia, 1952
6k1/5p2/1p2p1p1/2qPP2p/8/5Q1P/2r5/3RK3 b - - 0 1
[ ...Qg1+ ]

c)
L Konovalov vs Koblenc, Moscow, 1959
r2qkb1r/pp1b2pp/2n2n2/1B1p2B1/3Np3/2P5/PPQN1PPP/R3K2R b KQkq - 0 1
[ ...Nxd4 if Bxd7+ Nxd7 cxd4 Qxg5 ]

d)
David Dzhanoev vs Koblencs, Palanga, 1961
3R4/p4p1p/4bkpB/4b3/P7/r7/5PPP/3B2K1 b - - 0 1
[ ...Ra1 Kf1 Ke7 if Rd2 Bc3 ]


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